Question

Sabendo que A=1/3-3/4eB= -2/3+1/2,Calcule A.B

Answer 1

Vamos lá :

A = 1/3 - 3/4

Mmc(3 , 4) = 12

A = 1*4/12 - 3*3/4 = 4/12 - 9/12 = - 5/12

B = - 2/3 + 1/2

Mmc(3 , 2) = 6

B = - 2*2/6 + 1*3/6 = - 4/6 + 3/6 = - 1/6

A.B = (- 5/12).(- 1/6) = + 5*1/12*6 = 5/72

Espero ter ajudado !!!